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From J. H. Gilbert 9 January 1882
Summary
Thanks CD for Earthworms.
Discusses the problem of accounting for difference between nitrogen in permanent grassland and ordinary arable soil. Finds castings of earthworms rich in nitrogen. Asks CD if his observations enable him to explain the source. If from below top-soil, it would be a considerable manuring.
| Author: | Joseph Henry Gilbert |
| Addressee: | Charles Robert Darwin |
| Date: | 9 Jan 1882 |
| Classmark: | DAR 165: 45 |
| Letter no: | DCP-LETT-13605 |
